Canon AE-1 mirror stuck up (but eventually comes back down)?

My canon ae-1 started displaying this behavior: - After taking a photo, the viewfinder would stay black and i can not wind the lever again. - Whenever I would check it again (couple hours) the viewfinder would be clear again. Wind the lever, take one pic, repeat.

I looked behind the lens and the mirror does seem to be staying up. See video: - it can come down when i pull the lever on the bottom with the red dot. - I notice that the lever on the RHS is in the down position, and based on a comment on this post, https://www.flickr.com/groups/56408194@N00/discuss/72157616545134837/, the camera seems to be mid-shutter stroke

Is there anything I can do? At some point, the mirror is going back down, so I feel like I should be able to force it to come down sooner.

I am new to film cameras and would greatly appreciate help! thanks in advance!